Episode 447: Dinosaurs in North America: That includes Prehistoric Planet 2


Episode 447: Dinosaurs in North America: That includes Prehistoric Planet 2. 80 ton Alamosaurus, Tyrannosaurus shedding to Quetzalcoatlus, and sauropods being killed by lightning (however not for the explanation you assume)


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Paleo Pins: Diversity Expansion

The dinosaur of the day: Pectinodon

  • Seems in episode 5 of Prehistoric Planet, season 2
  • Troodontid that lived within the Late Cretaceous in what’s now Wyoming (Lance Formation)
  • In all probability seemed bird-like, with feathers, lengthy legs, and being a troodontid, had sickle claws on the second toes (solely know its tooth)
  • As a troodontid, might have had good imaginative and prescient and should have gone after small prey
  • Kind and solely species is Pectinodon bakkeri
  • Genus identify means “comb tooth”
  • Genus identify refers back to the comb-like serrations on the tooth
  • Species identify in honor of Bob Bakker
  • Described in 1982 by Kenneth Carpenter
  • In 1982, Kenneth Carpenter named Pectinodon in a paper about child dinosaurs from the Lance and Hell Creek Formations
  • Studied eleven taxa from 9 localities, based mostly on small tooth and elements of skulls that have been discovered by screen-washing (underwater washing and screening)
  • Helped present that child dinosaurs weren’t as uncommon as had been beforehand thought earlier than that time
  • Holotype of Pectinodon is a tooth, paratypes and referred specimens are tooth
  • Discovered “crowns of tooth strongly compressed laterally and recurved”
  • Described as an apparently small species, weighing beneath 220 lb (100 kg)
  • Holotype is an grownup tooth, the most important tooth, and is 6.2 mm lengthy and three.7 mm large (about 0.2 in by 0.1 in)
  • Paratypes are small and doubtless from infants
  • Different referred tooth are from adults
  • Enamel look much like Saurornithoides inequalis (beforehand referred to Troodon formosus and Saurornithoides junior)
  • Stated the tooth seems much like Velociraptor tooth, however some slight variations within the serrations
  • Has been thought-about to be synonymous with Troodon formosus
  • In 1991 George Olshevsky discovered it to be its personal species, Troodon bakkeri
  • In 2011, Lindsay Zanno and others analyzed how troodontids have been categorized, and located all of the specimens assigned to Troodon formosus have been most likely completely different species, and agreed Pectinodon bakkeri was legitimate
  • In 2008, Longrich discovered Pectinodon to be legitimate
  • In 2013 Phil Currie and Derek Larson additionally discovered Pectinodon to be legitimate, and mentioned the tooth may very well be present in each the Lance Formation and Hell Creek Formation
  • Different tooth from Dinosaur Park Formation have been referred to cf. Pectinodon (arduous to categorise particularly)
  • In 1985 Lev Nesov named a second species, Pectinodon asiamericanus, based mostly on a tooth present in Uzbekistan, but it surely’s thought-about to be a nomen dubium

Enjoyable Truth:

Sauropods would have been actually susceptible to lightning strikes, and never simply because they’re so tall.

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